StringAnagram.java

import java.util.Arrays;

public class AnagramCheck {
    public static boolean isAnagram(String word, String anagram) {
        if (word.length() != anagram.length()) {
            return false;
        }
        char[] chars = word.toCharArray();
        for (char c : chars) {
            int index = anagram.indexOf(c);
            if (index != -1) {
                anagram = anagram.substring(0, index) + anagram.substring(index + 1, anagram.length());
            } else {
                return false;
            }
        }
        return anagram.isEmpty();
    }

    public static boolean iAnagram(String word, String anagram) {
        char[] charFromWord = word.toCharArray();
        char[] charFromAnagram = anagram.toCharArray();
        Arrays.sort(charFromWord);
        Arrays.sort(charFromAnagram);
        return Arrays.equals(charFromWord, charFromAnagram);
    }

    public static boolean checkAnagram(String first, String second) {
        char[] characters = first.toCharArray();
        StringBuilder sbSecond = new StringBuilder(second);
        for (char ch : characters) {
            int index = sbSecond.indexOf("" + ch);
            if (index != -1) {
                sbSecond.deleteCharAt(index);
            } else {
                return false;
            }
        }
        return sbSecond.length() == 0 ? true : false;
    }
}